Claude Code Skills·Claude Skills·The open SKILL.md registry for Claude
ClaudSkills / Security / identity-access

Ad Environment Constraints

Category: Security  ·  Sub-category: identity-access  ·  Last updated:
Real-world Active Directory environment constraints that silently break attacks when ignored: NTLM disabled (Kerberos fallback), AES-only KDCs (RC4 blocked by GPO), LDAP signing and channel binding requiring LDAPS on 636, Kerberos clock skew (KRB_AP_ERR_SKEW), SPNs that must be FQDNs never short names or IPs (the misleading invalidCredentials), Protected Users / LAPS / gMSA / MachineAccountQuota, LDAP 1000-object paging, and VPN latency. Use this whenever a bind, TGT request, LDAP query, or SMB negotiation fails in a way that looks like bad credentials but is really hardening, or before running any AD tooling against a domain you have not fingerprinted. Standard-tooling knowledge (netexec, impacket, certipy, bloodyAD, kerbrute), no vendor-specific engine.
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Code and commands that work in a lab break in a hardened domain, and the failure almost never says what it is. A Kerberos SPN mismatch surfaces as invalidCredentials. NTLM being disabled surfaces as a logon failure. AES-only KDCs reject your RC4 request with an etype error you have to know to read. This skill is the checklist of those constraints and how to survive each one with standard tooling.

What this skill does

Ad Environment Constraints is a community-contributed Claude Code skill in the identity-access sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/ad-environment-constraints/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Ad Environment Constraints Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 196,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/ad-environment-constraints
curl -L https://claudskills.com/skills/ad-environment-constraints/SKILL.md \
  -o ~/.claude/skills/ad-environment-constraints/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/ad-environment-constraints/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/ad-environment-constraints/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\ad-environment-constraints\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Ad Environment Constraints Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/ad-environment-constraints/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Ad Environment Constraints skill do?
Real-world Active Directory environment constraints that silently break attacks when ignored: NTLM disabled (Kerberos fallback), AES-only KDCs (RC4 blocked by GPO), LDAP signing and channel binding requiring LDAPS on 636, Kerberos clock skew (KRB_AP_ERR_SKEW), SPNs that must be FQDNs never short names or IPs (the misleading invalidCredentials), Protected Users / LAPS / gMSA / MachineAccountQuota, LDAP 1000-object paging, and VPN latency. Use this whenever a bind, TGT request, LDAP query, or SMB negotiation fails in a way that looks like bad credentials but is really hardening, or before running any AD tooling against a domain you have not fingerprinted. Standard-tooling knowledge (netexec, impacket, certipy, bloodyAD, kerbrute), no vendor-specific engine.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Ad Environment Constraints skill?
Use Ad Environment Constraints when your Claude Code task falls under the Security category — specifically in the identity access area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Ad Environment Constraints" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Ad Environment Constraints skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Ad Environment Constraints is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
ClaudSkills. (2026). Ad Environment Constraints [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/ad-environment-constraints/
BibTeX
@misc{ad-environment-constraints-2026,
  author    = {ClaudSkills},
  title     = {Ad Environment Constraints [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/ad-environment-constraints/}
}

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Security scan

Grade A · scanned 2026-09-28 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 1 of 10 categories (network), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

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Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills
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